BibTeX
@MISC{_certificateof,
author = {},
title = {Certificate of Analysis Standard Reference Material ® SRM 2687},
year = {}
}
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Abstract
This Standard Reference Material (SRM) is intended for use in evaluating methods of phase abundance analysis of major phases in cement clinkers: the percentages of alite (C3S) 1, belite 2 (β-C2S), aluminate (C3A), ferrite (C4AF), and arcanite (K S). Each unit consists of three hermetically-sealed containers of approximately 10 g each of crushed portland cement clinker. The materials selected for SRMs 2686, 2687, and 2688 differ widely in phase abundance, crystal sizes, and distribution of crystals [1,2]. Certified Values: The certified values for SRM 2687 expressed as mass fractions, are provided in Table 1. A NIST certified value is a value for which NIST has the highest confidence in its accuracy, in that all known or suspected sources of bias have been investigated or accounted for by NIST. The certified values listed are based on the results of analyses performed at NIST using quantitative X-ray powder diffraction (QXRD) and from optical microscopy point count analyses conducted by both Construction Technology Laboratories, Inc. (CTL) 3 and ASTM C 1.23 Microscopy Task Group (MPC) [3,4]. The MPC analyses followed ASTM C 1356M [5] and the QXRD used Reitveld refinement of powder diffraction data [6,7]. Sampling for the X-ray study allowed assessment of within and between vial homogeneity and found the materials to be homogeneous. The uncertainty listed with each value is an expanded uncertainty, with coverage factor 2, calculated by combining a between-method variance [8,9] with a pooled, within-method variance following the
Keyphrases
analysis standard reference material srm certified value nist certified value cement clinker quantitative x-ray powder diffraction optical microscopy point count analysis mass fraction major phase hermetically-sealed container powder diffraction data x-ray study construction technology laboratory between-method variance microscopy task group coverage factor phase abundance standard reference material crystal size reitveld refinement crushed portland cement clinker expanded uncertainty phase abundance analysis vial homogeneity within-method variance
